The present invention prevents a local luminance reduction at defects in pixel electrodes with a rapid and easy method. The present invention provides a method of manufacturing an organic EL panel that includes a TFT panel and organic EL devices disposed over a surface of the TFT panel in matrix arrangement, each of the organic EL devices including a pixel electrode disposed over the surface of the TFT panel, an organic luminescent layer disposed over the pixel electrode, and a counter electrode disposed over the organic functional layer. The method includes the steps of: providing a TFT panel; patterning pixel electrodes on a surface of the TFT panel; detecting in the pixel electrodes defects in which the surface of the TFT panel is exposed; roughening a portion of the surface of the TFT panel by applying a laser beam onto the portion, the portion including a surface exposed through the defect in the pixel electrode; forming an organic functional layer over the pixel electrodes and the surface of the TFT panel exposed through the defect in the pixel electrode; and forming a counter electrode over the organic functional layer.